<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<style>
  .box {
    width: 800px;
    height: 800px;
  }

  .ch {
    background: hotpink;
    width: 200px;
    height: 200px;
    /* animation: pl 2s forwards; */
  }

  @keyframes pl {
    from {
      display: block;
      transform: translate(0, 0)
    }
    to {
      display: none;
      transform: translate(0, -100%)
    }
  }
</style>

<body>
  <div class="box">
    <div class="ch"></div>
  </div>
</body>

</html>
<script>
  </script>